Dsco supports any sized image in JPG, PNG or GIF format. We recommend providing very high resolution images as we will resize them for your trading partners so that they get the best size for their needs.
Images Hosted on DropBox
When linking to images hosted on DropBox, you must provide a link to the image with "?dl=1" added to the end of each URL. Without that, our servers will not be able to access the image as the DropBox system usually provides a web page that shows you the image instead of "just" returning the image itself.